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Learn the signs of window well drainage problems, when and how to improve drainage, and how window well drains are installed.. Inadequate window well drainage is responsible for many flooded ba.ts. A must read for those suspecting they have window well drainage problems.. The dirt near the window is dug out, to a depth of about foot below the bottom window sill. Then, the semi circular corrugated steel or plastic “wall” is placed in the hole to prevent the dirt from falling back in. This ised a “window well” and just like a regular “well,” it gathers water. If proper drainage hasn t .